Well the producer is Italian and she said there were a bit of everything in this movie. The first and second movie had mostly Slovakian or Czech extras involved besides American and British actors. And the only time Asians were included were two principals from the second movie(Henry O and Rona Figueroa). And half Hindi in the third with Ben Kingsley in the cast and his dragon will return for the fourth along with Romanian extras.
Sounds like they were always mostly european movies then.
I'm sure the director was hired because of Hellfjord.
The director have earlier directed the international popular Norwegian black comedy series "Hellfjord". I have seen New Zealand, Germans etc. that gave it 10/10 in reviews.
I recently re-watched Hellfjord with English subs just to see how all were translated. Only minor things were missing on translation, but didn't affect the series anyway for foreigners.